Bearing device and rotating machine

Abstract

A bearing device supports a rotary shaft that is rotatable about an axis extending in the horizontal direction, and includes: a bearing body which supports the rotary shaft; a support ring having a seating part including a support ring body that covers the bearing body from the outer circumferential side and a downwardly-oriented bottom surface that is provided integrally with the support ring body; and a bearing box which is provided separately from the support ring and which has a supporting surface abutting against the bottom surface. The bearing body has a ring part which covers the rotary shaft from the outer circumferential side; and a lower pad which is directly or indirectly supported by the inner circumferential surface of the ring part and which is slidably in contact with the outer circumferential surface of the rotary shaft.

1 . A bearing device that supports a rotary shaft rotatable about an axis extending in a horizontal direction, the bearing device comprising:
 a bearing body that supports the rotary shaft;   a support ring that includes a support ring body covering the bearing body from an outer peripheral side, and a pedestal portion provided integrally with the support ring body and including a bottom surface facing downward; and   a bearing box that is provided separately from the support ring and that includes a support surface to be in contact with the bottom surface,   wherein the bearing body includes a ring part that covers the rotary shaft from the outer peripheral side, and a lower pad that is directly or indirectly supported by an inner peripheral surface of the ring part and that is in sliding contact with an outer peripheral surface of the rotary shaft, and   the support surface extends on at least an extension line of a straight line connecting the axis to a center of the lower pad in a circumferential direction as viewed in a direction of the axis.   
     
     
         2 . The bearing device according to  claim 1 , further comprising:
 a lower key that is provided between the support ring body and the ring part, is disposed at a position corresponding to the lower pad in the circumferential direction, and extends in the circumferential direction,   wherein the support surface extends on at least an extension line of a straight line connecting the axis to an inner end portion in the circumferential direction of end portions of the lower key in the circumferential direction as viewed in the direction of the axis.   
     
     
         3 . The bearing device according to  claim 1 ,
 wherein the bearing box includes a bearing box body on which the support surface is formed at an upper portion, and side wall portions that are provided integrally with the bearing box body and that sandwich the support ring from both sides in the horizontal direction.   
     
     
         4 . The bearing device according to  claim 1 ,
 wherein a recessed portion as an accommodation space is formed at a middle portion of the bearing box where the support surface does not extend as viewed in the direction of the axis.   
     
     
         5 . The bearing device according to  claim 1 ,
 wherein the bearing body further includes an upper pad that is directly or indirectly supported by the inner peripheral surface of the ring part and that is in sliding contact with the outer peripheral surface of the rotary shaft, and   the upper pad is positioned on the extension line of the straight line connecting the lower pad to the axis as viewed in the direction of the axis.   
     
     
         6 . A rotating machine comprising:
 the bearing device according to  claim 1 ;   a rotary shaft that is rotatably supported by the bearing device; and   a casing that covers the rotary shaft from an outside.